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Fair Value Measurements Details of Book Value and Fair Value of Financial Instruments (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Fair Value, Balance Sheet Grouping, FinancialStatement Captions[Line Items]    
AFS, at estimated fair value $ 3,324,333 $ 3,187,390
HTM securities 888,989 965,867
Reported Value Measurement [Member]    
Fair Value, Balance Sheet Grouping, FinancialStatement Captions[Line Items]    
Cash and due from banks 1,157,965 1,638,614
FRB and FHLB stock 57,729 57,635
Loans held for sale 27,675 35,768
AFS, at estimated fair value 3,324,333 3,187,390
HTM securities 964,341 980,384
Net Loans 18,232,414 18,076,349
Accrued interest receivable 55,102 57,451
Other financial assets 478,961 565,491
Demand and savings deposits 19,632,873 19,594,497
Brokered deposits 248,833 251,526
Time deposits 1,659,468 1,727,476
Accrued interest payable 4,713 7,000
Short-term borrowings 452,440 416,764
FHLB advances and long-term debt 556,494 621,345
Other financial liabilities 299,695 288,862
Estimate of Fair Value Measurement [Member]    
Fair Value, Balance Sheet Grouping, FinancialStatement Captions[Line Items]    
Cash and due from banks 1,157,965 1,638,614
FRB and FHLB stock 57,729 57,635
Loans held for sale 27,675 35,768
AFS, at estimated fair value 3,324,333 3,187,390
HTM securities 888,989 965,867
Net Loans 17,588,031 17,519,497
Accrued interest receivable 55,102 57,451
Other financial assets 478,961 565,491
Demand and savings deposits 19,632,873 19,594,497
Brokered deposits 249,347 252,129
Time deposits 1,657,129 1,730,673
Accrued interest payable 4,713 7,000
Short-term borrowings 452,440 416,764
FHLB advances and long-term debt 509,423 605,719
Other financial liabilities 299,695 288,862
Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value Measurement [Member]    
Fair Value, Balance Sheet Grouping, FinancialStatement Captions[Line Items]    
Cash and due from banks 1,157,965 1,638,614
FRB and FHLB stock 0 0
Loans held for sale 0 0
AFS, at estimated fair value 373,717 127,618
HTM securities 0 0
Net Loans 0 0
Accrued interest receivable 55,102 57,451
Other financial assets 364,206 367,336
Demand and savings deposits 19,632,873 19,594,497
Brokered deposits 228,833 231,526
Time deposits 0 0
Accrued interest payable 4,713 7,000
Short-term borrowings 452,440 416,764
FHLB advances and long-term debt 0 0
Other financial liabilities 195,786 188,219
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member]    
Fair Value, Balance Sheet Grouping, FinancialStatement Captions[Line Items]    
Cash and due from banks 0 0
FRB and FHLB stock 57,729 57,635
Loans held for sale 27,675 35,768
AFS, at estimated fair value 2,950,616 2,985,105
HTM securities 888,989 965,867
Net Loans 0 0
Accrued interest receivable 0 0
Other financial assets 65,132 160,945
Demand and savings deposits 0 0
Brokered deposits 20,514 20,603
Time deposits 1,657,129 1,730,673
Accrued interest payable 0 0
Short-term borrowings 0 0
FHLB advances and long-term debt 509,423 605,719
Other financial liabilities 89,976 86,110
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value Measurement [Member]    
Fair Value, Balance Sheet Grouping, FinancialStatement Captions[Line Items]    
Cash and due from banks 0 0
FRB and FHLB stock 0 0
Loans held for sale 0 0
AFS, at estimated fair value 0 74,667
HTM securities 0 0
Net Loans 17,588,031 17,519,497
Accrued interest receivable 0 0
Other financial assets 49,623 37,210
Demand and savings deposits 0 0
Brokered deposits 0 0
Time deposits 0 0
Accrued interest payable 0 0
Short-term borrowings 0 0
FHLB advances and long-term debt 0 0
Other financial liabilities $ 13,933 $ 14,533